Import ubus tools.

3P/json/tests/test_set_serializer.expected

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+Test setting, then resetting a custom serializer:
+my_object.to_string(standard)={ "abc": 12, "foo": "bar" }
+my_object.to_string(custom serializer)=Custom Output
+Next line of output should be from the custom freeit function:
+freeit, value=123
+my_object.to_string(standard)={ "abc": 12, "foo": "bar" }
+Check that the custom serializer isn't free'd until the last json_object_put:
+my_object.to_string(custom serializer)=Custom Output
+Next line of output should be from the custom freeit function:
+freeit, value=123